Gases of the Blood 



623 



which shows the changes in the oxygen content of the blood with 

 changing pressure flattens out in the neighborhood of normal 

 pressure. 



Fig. 35 — Variations of blood gases at pressures higher than one atmosphere. 



We can show this in a still clearer manner in another graph 

 (Fig. 36). Let us take as the zero the barometric vacuum, let us 

 plot the pressures in atmospheres on the axis of the x's, and let us 

 put on the axis of the y's values proportional to the oxygen content 



